Motor-controller.



A. l. CLINE.

MOTOR CONTROLLER.

APPLICATION msn M-AY22.1915.

mr mmm: runs cu., mmm-uma., wasumcmn. n, c.

UNITED sTATEs 4raTnNT ormoni.

ALLAN J; CLIE, 'on CHICAGO, rumors.

MoTonfcoNTnonLER.

Specification of Letters iatent.

Patented Aug. 6, 1918.

Application filed May 22, 1915. Sera11o.f29,763;

, the like, at.,ditlerent speeds, and-seeks to provide an improved meanscomprising a manually Aoperable switch by which the operatorofthe pressor other machine has fullV control of the different motor speeds,

- in combination with automatically operating devices which protecty themotor and automatically control its acceleration in accordance with thesetting of the manually operable switch. A further .object of the vinventionis toprovide an arrangement in which` the main partsV whichcontrol the armature circuit can be located at one` station at adistance from thel main controlling station or switch and in which it isonly necessary to connect small, light wires to the controllingswitch sothat the latter may be conveniently mounted on the machine withineasyreach of the operator.

The invention consists in thefeaturesof improvement hereinafter setforth, .illustrated in the accompanying drawing and more .particularlypointed out inthe appended claims.` g

`In the aCQOmpanying'draWing, the invention is illustrated in itspreferred arrangement. l,

The conductorsl() and 11 of the supply circuit forthemotor 12, areconnected to theV mains 13 by ya knife. switch 14 in the usual manner.kThe controlling devices are preferably located at two stations, themanuallyoperable or main controlling switch being located 'at a stationA and the parts which, under controlof the switch, govern theacceleration of the inotor, being located at iLlther station,4 B.

'lhe station A comprises a. swinging, manuallyA operable switch arm 15anda set of coperating .contact bars 16, 17, 18, 19 and 20 mounted onalsuitable support 21. The

` switch` arm is arrangedto move between a pair `of stops 22 and 23 overthe contact bars and,-V overthe ycontacts of a variable field resistance24 which is connected to the cntactfba 16. yThe .parts are so arrangedthat, as the switch arm moves from its open position in engagement withthe stop 22, it initially engages the contact bars 16 and 17, andthereafter successively engages the contact bars 18, 19 and 20. Theswitch arm remains in engagement with the contact bars 17, 18, 19 and 20until its movement is arrested by the stop 23, but between the ends ofits movement it is disengaged from the Contact bar 16 and thereaftersuccessively engages the contacts of the variable iield resistance 24.

Station B comprises a main resistance 25 for the motor vcircuit and aset of electromagnetic switches 26, 27 and 2S, which4 are arranged tocut out successive portions of the main resistance 25. An electro-magnetic starting switch 29 is also preferably located at station B, and anelectro-mag netic switch 30 is arranged at station B forshort-circuiting the iield resistance 24.

The conductor 10 of the supply circuit is connected to one of the motorterminals, the other motor terminal being connected to one of theterminals of the resistance 25.

The other resistance terminal and the main supply conductor 11 areconnected to the contacts of the starting switch 29. The motor may beeither shunt or compound wound. In the arrangement shown, the iield 31is arranged to be connected to the supply conductor 10 by the switch arm15 and contact bar 16, and to the supply con- Vduc'tor 11 by thecontacts of the starting switch29. The coil of the starting switch isinterposed between the supply conductor lland the contact bar 17, andthe switch arm 15 is connected to the supply conductoi' 10.

The coils of the resistance switches 26,

27 and'28 are interposed in branch circuits between the negative poleofthe motor and thev positive supply conductor 10 and these branchcircuits are arranged to be successively closed as the controllingswitch arm 15 engages the contact bars 18, 19 and 20. The coils of theseresistance switches are thusen'ergized by the counter electromotiveforce developed by the motor, and the windings are such that, when incircuit, these coils will operate their contacts successively, tothereby reduce theV resistance of the motor circuit, as the motoraccelerates and reaches different predetermined speeds and therebydevelops a counter electromotive force of different predeterminedamounts.

,controllingswitch 15 can quickly close the operating circuits of one ormore of theresistance switches, the switches will not oper-` ate untilthe speed of the Vmotor has increased sufficiently to develop therequisite counter velectromotive force. Although the operator may setthe switch arm -in accordance with the desired speed, the resistanceswitches will automatically protect the motor and prevent sudden rushesof current therethrough.

The arrangement is preferablyV such that, when the controlling switcharm 15 is en`V gagedv with the contact bar 20 to thereby close theoperating circuit of the resistance switch 28, themotor will operate atnormal speed. If it lis desired to further accelerate theV motor, theswitch arm may be moved over the ccntactsrof the field resistance tothereby cut down the current passing throughthe motor field and soincrease the speed of the motor. W'hen this occurs, theresistance'switch 28 has been operated and the coil ofthe switch 30 is'connected' in Vseries with the armature of the motor.L The winding ofthis coil is such that, if the field resistance 24 is thrown into thecircuit too quickly'and causes a rush of current through the motorarmature, the contactsu of the switch 30 will close a short circuitaround the field resistance and thereby check therush of current throughthe motor armature and interposedy in the armature circuit.

reduce its speed. The contacts of switch 3G will then open and, ifanother rush of current passes through the armature willagain close. Inthis way, the contacts of the switch 30 will open and close, orfiutter,as itis termed, untilthe motor reaches a definite predeterminedspeed inY accordance with'the setting ofthecontrolling switch arnrl;

In operation, the dierentcircuitscan be traced as follows. When the`vcontrolling switch arm is moved fromfin'itial position, it

first engages thecontact bars-16 and 17 to I 10, by conductor 32, switcharm V15, contact bar 17 ,conductor 33, coil of switch'29, and conductor34 to main conductor 11. The 'contacts of switch 29 are then engaged andthe main supply circuit is closed from con-V ductor 10 through thearmature of the motor, conductor 35, armature resistanceY 25,

conductor36, and: contacts of switch 29 to main conductor 11'.y `Thefield circuit is also closed from main conductor 10 by conductor 32,switch arm 15, contact bar 16,'conduct-or 37, through the field and byconductors 38 and 36 and contacts. of switch 29 Vto the main conductor11. The motor will then operate at slow speed, the entire res'istance`25being ,They coils of the resistanceswitches 26, 27 and-28 areconnectedto the negative terminal of the motor by a` conductor 39, andto .the contact bars. 18, 19 and 20 by branch conductors 40. `One of thecontacts of each ofV theswitches 26, 27 and 28 is connected Y to thenegative terminal of the motor by conductors 35 and 41. The othercontactsuof switches 26 and 27 are connected by conductors 42 tointermediate points of the armaby conductors 35 and 39, coil'of'switch26,

oneV of the conductors 40, 'contact bar 18, switch arm 15 yand conductor32 to thespositive main conductor-10; 'If theinotor has been running forsome appreciable time at slow speed, suflici'entcounter electromotiveforcewill be developed thereby to energize the'coil ofswitch 26 andthereby. close its contacts to cut outa portionof' the resistance. `25,V"and thereby effect an increase' in speed of the motor. But if theswitch arm 15 is quickly shifted from its openposition into engagement'with Vthe contact barl 18, while the circuit of coil'26 is closed, itwill not operatev atonce,'but` its contacts will remain Open to maintainthe entire resistance 25 in the motor circuit until the motor hasreached a certain'. predetermined speed and developerate inV a similarmanner, except that a greater electromotive force lis requiredtoeperatev-'switch 27`anda ystill greater to operate switch 28. Hencethe motor must proportionately increase its spee'd to effect theVoperation of these switches and the cutting out of the sectionsA of ,theresistanceV 25 con trolled thereby. It is obvious that 'in' casetheoperatorV quickly shiftsthe switch armv 15 from open positionintovengagement Vwith the contact'bar`20, that the resistance' switches 26,'27 and 28 willnot operate at'o'n'ce,`but

will successively operate as thespeed:v ofthe motor gradually increases'to cutjrout'successlve portions ofthe resistancel" Preferably, asstated,V he motor ranged to run at normal speed when the ref sistanceswitch 28 isoperated. It'shouldbe noted that the coil of switch 30 isinterposed in the conductor 43 andthat,jwhen the contacts of switch 28are closed, andthe motor i is running at normal speed, this coil is inseries with the armature of the motor.` lIf aj further increase of speedisV requiredfthe switch arm is movedfover oneror YI'n'or'eof is War;

the contacts 'of theY fieldv resistance 24.` If

the. YswitchY arm is'thusl moved 'quickly' andeausesfarrrushrdfcurrentfthrougmtheiarma .foperate saidresistanceswitches Vasjthemotor- .u f ture,theswitch-39willl respond-andclose reaches differentpredetermined:.speedsshortcircuitarcundfthelieidresistanccffromr 1-14. Ascontrollerwforelectricz-.fifmn'tors,` the` if; g switch arm 15 by aconductora-44,#contacts1w-combination with ailmotor, asupply-,circuit ofswitclif'Ogandj by??conductorsglJandl 37:2. and aresistance oanelectro-magnetic'start- ;7.0 through thenrotoriield-Cllhe=sititch30-lwill switcharranged.sto.` cl0se=ftlie circuit...then-iflutte'iwv'as`described1untilvthemotornsthrouglif;said fmotor.:and said -resistancep speedj-reachesI-a,predeterrninedlamount,=:in `alseries slof electro-:magnetic :resistance :.15 accordancefwi-th thepositioufeof@thecontrolegaffswitches:iresponsiveto .thefcounterelectra.. i ling fs'witehearm 15.41 'l It"shuld` beinoted-tli-atfnonefofathecen-.arrangedsto operate vv:as the motorreachespductorsiwhichcarry u'the'l armaturelfcurrent.lidiEerentnpredetermined,speedto cut out-sue. i areconnected-tothecontrollingstationfA;` cessivesportionsaot;saidYaresistance, and a 1V so thationlylsnialldightwiresrneed.be com.efmastenswitch arranged tofsuccessi-velyy `close nectedtheretow'lorthis reason,:rfitl-fcan bern Aand opfern' the.operatin-gcircuits of'lsaid elec'- 8.0, locatedfon al convenient-,p aartv o'ithe-pressv oraitno-magmetic star-tinge and resistanceswitches f .e ifotheriachineldri-veneby tlefmotor witlieutln reverse order.'`A-requiringiexpensivewiringf-fIt shouldnlso 5. Insarcontrollerfforelectricmotors, the` be noted-'that -viv-hileltheop'erator'ahasY full 3F.:ombinfationof .la Yvariable armature; and fieldcontreL----o'f1fthe"dierentspeedsand can eresistances, sa;Y series@y 'ofelectromagneticf...815f

quickly' shiftvthel main controllinge"switch@V switches;:controllingxsaid garinature inesisteither-to increase orlwretardithespeed of-fthei' Aance .and arranged, when-in circuit; toopermotor, theacceleriatitin\o-themotonisA auto-crate automatically. as :themotor-reachesI-difmatically{c'entrolled ferentvazpredetcrmined.uspeeds,manuallyrf-...

It 4is"v obiziousflthat, trollerfgzanhbeprovided'Withro`ver'load.cirff-successively :closefthe operatingfcircuits of cuitbreakerff-cr-anos-voltage ff'releasex coil, :said -series..of.-Velectro-magnetic switches, and and .that i`iff-could#also' beprovidedwvithw'icoperatesavcith said variablekield resistance-.wi`means-x-ffor yreversi-I-igwfthe "motor: Qtherf .lato accelerateithemotorfand anf automatic changes'in thedetails-set?fontlrlmayfbe4maden-1: electrmagnetie; switchefori shortg-:circuiting r 95 withoutdeparture-rointhe essentials ofithelfsaid field resistance:awhile:abnormal condi-v invention;asldefinedliin-theclaimsgzfm tions prevail inthe motor..circuit;ff; a

I claim?asbmyiinventionel? is 6. In .arcontrollerxfor electricrmotors,the. A l. In' Ya'controller@forlvelectricfmOtOrS,.thee combination;.tvith-.a-.motor. and'asupplyfcirf combinationfea4 seriesofresistanceswitches,-J a seriesofff'electromagnets:arrangedg when# andAfield :circuits:of'.said'motoryiaeseriesof` in cireuitytoeperatcsaidswitcliesautomatingmelectrofmagnetic'aswitches responsive; tothe: y n cally Hand in sI-1 ccessieni-as` predetermined,zvfzcountenelectromotiveforcedeveloped by the electri'econditionsfiiareestablished,. ;:and la jimotcnfand arrangedato :cutout successive,-:4 :ffreelymdvablespeed-controlling!swltchrftoii':portionsfof*.said' armature.resistance asf-the` 1.0. successijlely'closing y and openingxtheemf:moteur-caches.diiiferentpredetermined speedscf; cuitsofsaidmagnetslinsreverse order. a manually Ioperable controlling switch.arm .n e;

2. In a controller for electric motors, arranged to successively closethe operatthe combination-witliadmotor and l"sup-Ming circuits oi?saidfelectro-magnetic switches@y ply circuit, of a series of resistancesw1tche`s,'fand thereafter coperate with said field re- 110 a series ofelectro-magnets arranged when sistance to accelerate the motor, and anaut0- in circuit to operate said switches automatlmatic.electro-magnetic switch responsive to cally and in succession as themotor reaches fluctuation of current through the armature differentpredetermined Speeds, and a freely circuit for short-circuiting saidfield resistmovable m-anually operable controlling ance until the motorreaches a predetermined switch arranged to successively close and speedin accordance with the setting of said open the circuits'of said magnets1n reverse controlling switch arm. order. 7 In a controller for electricmotors, the

8. In a controller for electric motors, combination with a motor and asupply cirthe combination with a motor and its supcuit, of variableresistances in the armature ply circuit, of a series of resistanceswitches, and field circuits of said motor, an electroa series ofoperating electro-magnets theremagnetic starting switch for closing thefor, and a manually operable master switch armature circuit of saidmotor, a series of arranged as it is shifted to close the circultelectro-magnetic resistance switches arranged of said motor andthereafter successively to operate as diiierent predetermined elecclosethe circuits of said magnets and, in trical conditions are establishedin the armareverse order, to successively open said cirture circuit tocut out successive portions of cuits, said magnets being responsive tothe said armature resistance, a manually opercounter-electromotive forcedeveloped by able controlling switch arm arranged to the motor andarranged to automatically initially close the operating circuit of saidmoti-venforce".developed'.bym-the motor fand 7.5:

it@ desiredfrthe' conoperable-controlling switch .arm arranged-to; -90F- cuit, 'of .variablefresistances in thearmature stl-00 if" Yio Ycontacts of'vsaid iield resistance, and a {iut-Y tering switch atthemain station responsive to*fluctuations of current in the armaturecircuit and controlling a short circuit around starting switch and thefield rcircuit of the motor, and thereafter successively close theoperatingcircuits of said resistance switches and engage the contacts.of said variable eld resistance to accelerate the motor, and

an automatic electro-magnetic switch having its coil in series With thearmature for shorti circuiting i said field resistancev until the motorreaches a predetermined speed in ac-V cordance With the setting of saidswitch arm.

8. In a controlling system for electricV motors, the combination of aniain station t* comprising yan electro-magnetic starting switch` for.closingthe armature circuit, a variable armature resistance, and-aseries of electro-magnetic resistance switches arranged to cut outsuccessive portions ofl said armature resistance as differentpredetermined electrical conditions are )established in the armaturecircuit and 1a controlling station'A comprising a manually operableswitch arm, coperating'contact bars land a variable field resistance,said switch-arm beingarranged to initially close the field circuit andthe operai;`

ing circuit of said starting switch and^thereafter successivelyclose-the operating circuits of said resistance switches and engage thesaid eld resistance. f 9.-In a-controller or'electric operatingelectromagnet therefor, and *a Genies of this .invitentl may`be-nolnlt'aiied motors, theal combination With ay motor, a supplycircuit andfa resistance, of a resistance switch, an.y

Vvcounter-electroinotive force developed by the f motor and arranged toautomatically oper- L ate said svvitchk as the-motor reaches a, certainpredeterminedspeed. s p l0. In a-.controller for electric motors7 thecombination With a motor, and afsupply lcircuit therefor', ofresistances in the armature v and iield circuits of said motor,l anvelectromagnetic sWitch' responsive to the counter? electromotive forcedeveloped bythe -motor and, arranged toVV automatically cut outsaidv jarmatureV resistance as the motor reaches; a,v

certain predetermined speed, and a manually 'operable controlling switcharranged vto vsuc- Y cessively close the rsupply circuit .of said ,Y v

motor` and the operating circuit of said electromagnetic switch -tosuccessively increase Y the motor speed and vthereafter cooperate With'said fieldresistance to furthervaccelerate the motor, ysaidsvvitchlbeing: arranged i to coperate with said iield resistance and:open said circuitsiin reverseA orderl to suc-1V cessively decrease themotori speed. ,Y 11. In a controller for electric m0tors,vthe

combinationof amotor and its supply' cir. cuit,of resistances inthearmature and field'l 4 circuits, respectively, of said motor, lan elec-V tromagnetic switchiarranged to automatically out out said armatureresistance as .the motor reaches a certain predeterminedspeedha imanually operable controlling switch farranged to successivelyclose'thesupplycirr-,i i

cuit of said motor and Vthe operatingcircut of lsaidelectromagnetic-switch and. there- Y after cooperate with. said fieldresistance to accelerate themotor, and an automatic'electromagnetic.switch responsiveY .to ,uctua- Y. '80

tions of current through the.` arinature'circuit for intermittentlyshort circuiting said field resistance l until the motorv reaches. aprede#

